Ergonomic and functionally-efficient one-hand user input interface



FIG. 1 is a perspective view of an ergonomic and functionally-efficient one-hand user input interface, in accordance with the present invention.

FIG. 2 is a top view thereof.

FIG. 3 is an underside view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a rear view thereof.

FIG. 6 is a is a side view thereof; and,

FIG. 7 is a corresponding view thereof.

The broken lines showing the environment in the figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an ergonomic and functionally-efficient one-hand user input interface, as shown and described. 